Answer in brief
CVE-2026-93795 records a Unknown severity vulnerability in blk-cgroup: fix leaks and online flag on radix_tree_insert failure. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e85f02d45b5977c0326a8d854c6db878aa6b34a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4c0d150fb98ea40760611979f4e664c244b20966 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dbbca20764382b4d411ec2918f4e278ffe547acc || >=0 <6.12.111 || >=0 <6.18.53 | 6e85f02d45b5977c0326a8d854c6db878aa6b34a, 4c0d150fb98ea40760611979f4e664c244b20966, dbbca20764382b4d411ec2918f4e278ffe547acc, 6.12.111, 6.18.53 |
Published upstream
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 25, 2026
In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: fix leaks and online flag on radix_tree_insert failure When radix_tree_insert() fails in blkg_create(), the error path has two issues: 1. blkg->online is set to true unconditionally, even when the blkg was never fully inserted. Move the assignment inside the success block. 2. The error path calls blkg_put() without first calling percpu_ref_kill(). Because the refcount is still in percpu mode, percpu_ref_put() only does this_cpu_sub() without checking for zero, so blkg_release() is never triggered. This permanently leaks the blkg memory, its percpu iostat, policy data, the parent blkg reference, and the cgroup css reference — the latter preventing the cgroup from ever being destroyed. Fix by replacing blkg_put() with percpu_ref_kill(), matching the pattern used in blkg_destroy().
Quoted source text, attributed separately from HOL analysis.